code: def test_forward_cpu(self):
      self.check_forward(self.x)
  
file_path: chainer/tests/chainer_tests/functions_tests/math_tests/test_ndtri.py
imports: import unittest
  import numpy
  import chainer
  from chainer import backend
  from chainer.backends import cuda
  import chainer.functions
  from chainer import testing
label_desc: Use image node_id 3 for calling the TestNdtriExceptions obj's underlying member method code with example usage: obj.test_forward_cpu() without return types